Shining magnon on quantum Hall ferromagnetic junctions

ORAL

Abstract

The quantum Hall (QH) ferromagnetic state in graphene is a unique platform for investigating the properties of magnon excitations, which can be generated by separately biasing two QH edge states of opposite spin. In our work, we explore the magnon interaction with a QH ferromagnet junction. The state of the junction can be controlled by non-local magnon excitations created elsewhere in the sample. Our results may assist in developing the evolving understanding of the ground states and excitations in this broken SU(4) symmetry system, as well as enable the future development of spin-based devices in 2D materials.

*Transport measurements by C.C., L.Z., E.G.A., T.F.Q.L., and G.F., were supported by the NSF Award DMR-2004870. Sample fabrication and characterization by C.C. and L.Z. were supported by the Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, U.S. Department of Energy, under Award No. DE-SC0002765. F.A. was supported by a URC grant at Appalachian State University. K.W. and T.T. acknowledge support from JSPS KAKENHI (Grant Numbers 19H05790, 20H00354, and 21H05233). The sample fabrication was performed in part at the Duke University Shared Materials Instrumentation Facility (SMIF), a member of the North Carolina Research Triangle Nanotechnology Network (RTNN), which is supported by the National Science Foundation (Grant ECCS-1542015) as part of the National Nanotechnology Coordinated Infrastructure (NNCI).

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Presenters

  • Chun-Chia Chen

    • Duke University

Authors

  • Chun-Chia Chen

    • Duke University

  • Lingfei Zhao

    • Duke University

  • Ethan G Arnault

    • MIT Research Laboratory of Electronics
    • Duke University
    • Massachusetts Institute of Technology

  • Trevyn Larson

    • Duke University

  • Kenji Watanabe

    • National Institute for Materials Science
    • Research Center for Functional Materials, National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Kyoto Univ
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science
    • Kyoto University
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institute For Materials Science
    • NIMS
    • National Institute for Material Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Francois Amet

    • Appalachian State University

  • Gleb Finkelstein

    • Duke University